Pumps A and B

Pump A fills the tank for 12 minutes, and pump B for 24 minutes. How long will it take to fill the tank if he is only three minutes work A and then both pumps A and B?

Correct answer:

x =  9 min

Step-by-step explanation:

121x+241(x3)=1  1/12 x+1/24 (x3)=1  3x=27  x=327=9  x=9=9 min



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